{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\hline\hline
                    &\multicolumn{1}{c}{\specialcell{\;Distance \\ HH-WS (m)}}&\multicolumn{1}{c}{\specialcell{\;\;\;Distance \\ HH-WS (min)}}&\multicolumn{1}{c}{\specialcell{Observed \\ \; storage}}&\multicolumn{1}{c}{\specialcell{Reported \\ \; storage}}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}\cmidrule(lr){5-5}
                    &\multicolumn{1}{c}{(1)}   &\multicolumn{1}{c}{(2)}   &\multicolumn{1}{c}{(3)}   &\multicolumn{1}{c}{(4)}   \\
\hline
As safe source (baseline) x treated&      -2.775*  &       0.075*  &      -0.021   &      -0.025   \\
                    &     (1.663)   &     (0.039)   &     (0.039)   &     (0.045)   \\
Low As Source (baseline) x treated&       0.956   &       0.038   &       0.010   &       0.019   \\
                    &     (1.518)   &     (0.030)   &     (0.039)   &     (0.039)   \\
Moderate As Source (baseline) x treated&       1.270   &       0.083*  &       0.000   &       0.003   \\
                    &     (4.348)   &     (0.048)   &     (0.068)   &     (0.076)   \\
High As Source (baseline) x treated&       3.883   &       0.001   &      -0.036   &       0.021   \\
                    &     (2.710)   &     (0.049)   &     (0.063)   &     (0.054)   \\
\hline
R$^2$               &        0.03   &        0.03   &        0.07   &        0.03   \\
N                   &        5832   &        5729   &        6050   &        6051   \\
\hline\hline
\end{tabular}
}
